New Features in Cisco IOS XE 3.6S Releases

This chapter provides information about the new features introduced in the Cisco IOS XE Release 3.6S.

Note Cisco IOS XE 3.6S inherits all supported features from Cisco IOS Release 3.5, which is not described in this document. For more information about Cisco IOS Release 3.5, see the Release Notes for Cisco IOS XE Release 3S.

ACFC and PFC Support on Multilink Interfaces—Using the Address and Control Field Compression (ACFC) and PPP Protocol Field Compression (PFC) Support on Multilink Interfaces feature, you can control the negotiation and application of the Link Control Protocol (LCP) configuration options for ACFC and PFC.

This release introduces support for ACFC and PFC support on serial interfaces on the T1/E1 and optical interface modules. This feature includes support for the following commands:

– ppp acfc local { request | forbid }

– ppp acfc remote { apply | reject | ignore }

– ppp pfc local { request | forbid }

– ppp pfc remote { apply | reject | ignore }

For more information about configuring ACFC and PFC, see the following documents

Egress QoS policies on main physical interface for port shaping + H-policies on EFP—Previous releases did not support QoS policies on interfaces configured with an Ethernet Flow Point (EFP) or port-channel member links with EFPs. This release introduces support for hierarchical QoS policies on EFP interfaces. For more information about how to configure QoS on EFP interfaces, see

CFM on Port-Channel Interfaces—This feature provides support for IEEE 802.1ag (CFM) on port-channel interfaces for end-to-end connectivity fault management on Ethernet networks. For details about this feature, see:

H-VPLS N-PE Redundancy for MPLS Access—This feature allows user provider (U-PE) devices to be dual-homed to network provider edge (N-PE) devices in a loop-free topology with MPLS as the access/aggregation domain. For details about this feature, see:

IPv6 Quality of Service Classification—This feature allows you to define traffic classes, create and configure traffic policies (policy maps), and attach those traffic policies to interfaces. The Cisco ASR 903 Router supports classification of IPv6 traffic based on DSCP or Precedence values on ingress and egress interfaces. For details about this feature, see

IPv6 Quality of Service Marking—This feature introduces support for marking IPv6 traffic with DSCP or Precedence values. IPv6 QoS is supported on ingress and egress interfaces. For details about this feature, see

MLPPP - Multilink PPP—Multilink PPP (also referred to as MP, MPPP, MLP, or Multilink) provides a method for spreading traffic across multiple physical WAN links and is described in RFC1990. For details about this feature, see:

Support for Weighted Random Early Detection—This feature introduces support for Weighted Random Early Detection (WRED) for congestion avoidance on egress interfaces. For details about this feature, see: